I am using the Honeywell air purifier in my bedroom. It has made such a difference when I sleep. It is amazing how it filters the air,  I no longer have a stuffed up head and headache when I get up in the morning.  I adjust the cleaning level to fit my needs. During the day I have it on the high setting to clean the air more efficiently and I lower the setting at night to reduce noise and still maintain purifying the air.